<!DOCTYPE HTML>
<html>
<head>
    <title>Test My WebSocket</title>
</head>


<body>
TestWebSocket
<input  id="text" type="text" />
<button onclick="send()">SEND MESSAGE</button>
<button onclick="closeWebSocket()">CLOSE</button>
<div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;


    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
        //连接WebSocket节点
        websocket = new WebSocket("ws://localhost:8107/connectWebSocket/?EIO=3&transport=polling&t=1598462849551-52");
    }
    else{
        alert('Not support websocket')
    }


    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };


    //连接成功建立的回调方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
    }


    //接收到消息的回调方法
    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
    }


    //连接关闭的回调方法
    websocket.onclose = function(){
        setMessageInnerHTML("close");
    }


    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function(){
        websocket.close();
    }


    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }


    //关闭连接
    function closeWebSocket(){
        websocket.close();
    }


    //发送消息
    function send(){
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>